Malicious PDF — malware analysis report

Static analysis result for SHA-256 768587f924282a08…

MALICIOUS

PDF

75.0 KB Created: 2021-09-12 06:45:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: bcd8cdf1e6aa1fd995363748510c8724 SHA-1: 59f067a49031f01bed5c369f34b5a4b6fa951fec SHA-256: 768587f924282a08fcf9513a81b8cf18b7a570484a136290dce0c11c2e1e8bbb
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file contains embedded JavaScript and multiple external URIs, indicating a malicious intent to redirect users to other sites. The ML classifier and ClamAV detection strongly suggest this is a phishing or malware distribution attempt. The presence of embedded JavaScript points towards an attempt to execute malicious code within the PDF viewer.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL http://airmon.hu/images/files/32670336258.pdf
    • http://www.next-conseil.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1613095290c7f6---45163760634.pdf
    • https://srsatta.com/ckfinder/userfiles/files/dasogijen.pdf
    • http://conniecorsentino.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/33618629169.pdf
    • https://dascalita.ro/app/webroot/files/userfiles/files/68206415805.pdf
    • http://costruzionibulagna.it/userfiles/files/77511980070.pdf
    • http://chiron-ventures.com/chiron/home/img/upload/files/210912090801627145o0wzw.pdf
    • https://fermuar.com/wp-content/plugins/formcraft/file-upload/server/content/files/161358b3dbe27e---wabiruxozolekebizu.pdf
    • http://tea-ra.com/user_data/upload/save_image/files/rexasanewap.pdf
    • http://pillshop.ru/uimg/files/mojawedoxadubidufam.pdf
    • http://gs-metals.com/filespath/files/20210904230702.pdf
    • http://dailygiasi.com/uploads/userfiles/file/56339278878.pdf
    • https://niboparis.com/upload/fckeditor/files/49702113274.pdf
    • http://esoftland.com/userfiles/file/dafejipajowanikuponi.pdf
    • http://phuketdriveschool.com/userfiles/file/29919974560.pdf
    • http://terredellamagnagrecia.com/userfiles/files/61725521860.pdf
    • https://exam11.menapoint.com/app/webroot/upload/files/xidep.pdf
    • http://stsmcc.org/www/js/ckfinder/userfiles/files/60652487770.pdf
    • https://unaizahic.com/Files/files/39579552210.pdf
    • http://ahdjcm.com/upload/files/rojajini.pdf
    • http://giprozdraw.ru/ckfinder/userfiles/files/bixoxenoxenegabi.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=free+download+excel+to+pdf+converter
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c0e1.bin
07e1eb9b33160f85fbaaac9a68e1353b2158c38d526c0edc2e60a49584995c43		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC0E1 17724 bytes
font_01_sfnt_off0000ee53.bin
b717dae2e50c18415d8dfadbed51eefef3fe096e29c9599c58010b57359c86e7		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEE53 10584 bytes
font_02_sfnt_off000106ae.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x106AE 16792 bytes

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